Crossword Genius

Twit of a girl who lost her head (3)

Ross

I believe the answer is:

ass

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'twit' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for ass that I've seen before include "Braying animal" , "Small hoofed animal" , "Donkey or silly person" , "Bottom, temporarily" , "Foolish person; animal" .)

I've seen this clue in the Evening Standard.
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